Apples, NAA, Fenoprop
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STOP-DROP sprays prevent excessive pre-harvest drop of Jonathan and Delicious apples.
Recent research has thrown more light on the best methods of employing these materials.
TWO CHEMICALS used as "stop-drop" sprays are available commercially in Western Australia. One of these, alpha napthalene acetic acid (NAA), is also well known as a thinning spray for apples.
Shorter, N H. and Cripps, J.
"Stop-drop sprays for Jonathan and Delicious apples,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 7
, Article 2.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol7/iss12/2